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147 lines
4.7 KiB
Python
147 lines
4.7 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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"""Some classes to conserve Vim's state for comparing over time."""
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from collections import deque
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from UltiSnips import _vim
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from UltiSnips.compatibility import as_unicode, byte2col
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from UltiSnips.position import Position
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class VimPosition(Position):
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"""Represents the current position in the buffer, together with some status
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variables that might change our decisions down the line."""
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def __init__(self):
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pos = _vim.buf.cursor
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self._mode = _vim.eval('mode()')
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Position.__init__(self, pos.line, pos.col)
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@property
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def mode(self):
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"""Returns the mode() this position was created."""
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return self._mode
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class VimState(object):
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"""Caches some state information from Vim to better guess what editing
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tasks the user might have done in the last step."""
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def __init__(self):
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self._poss = deque(maxlen=5)
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self._lvb = None
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self._text_to_expect = ''
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self._unnamed_reg_cached = False
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# We store the cached value of the unnamed register in Vim directly to
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# avoid any Unicode issues with saving and restoring the unnamed
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# register across the Python bindings. The unnamed register can contain
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# data that cannot be coerced to Unicode, and so a simple vim.eval('@"')
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# fails badly. Keeping the cached value in Vim directly, sidesteps the
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# problem.
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_vim.command('let g:_ultisnips_unnamed_reg_cache = ""')
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def remember_unnamed_register(self, text_to_expect):
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"""Save the unnamed register.
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'text_to_expect' is text that we expect
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to be contained in the register the next time this method is called -
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this could be text from the tabstop that was selected and might have
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been overwritten. We will not cache that then.
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"""
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self._unnamed_reg_cached = True
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escaped_text = self._text_to_expect.replace("'", "''")
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res = int(_vim.eval('@" != ' + "'" + escaped_text + "'"))
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if res:
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_vim.command('let g:_ultisnips_unnamed_reg_cache = @"')
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self._text_to_expect = text_to_expect
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def restore_unnamed_register(self):
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"""Restores the unnamed register and forgets what we cached."""
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if not self._unnamed_reg_cached:
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return
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_vim.command('let @" = g:_ultisnips_unnamed_reg_cache')
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self._unnamed_reg_cached = False
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def remember_position(self):
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"""Remember the current position as a previous pose."""
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self._poss.append(VimPosition())
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def remember_buffer(self, to):
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"""Remember the content of the buffer and the position."""
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self._lvb = _vim.buf[to.start.line:to.end.line + 1]
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self._lvb_len = len(_vim.buf)
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self.remember_position()
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@property
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def diff_in_buffer_length(self):
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"""Returns the difference in the length of the current buffer compared
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to the remembered."""
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return len(_vim.buf) - self._lvb_len
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@property
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def pos(self):
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"""The last remembered position."""
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return self._poss[-1]
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@property
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def ppos(self):
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"""The second to last remembered position."""
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return self._poss[-2]
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@property
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def remembered_buffer(self):
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"""The content of the remembered buffer."""
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return self._lvb[:]
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class VisualContentPreserver(object):
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"""Saves the current visual selection and the selection mode it was done in
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(e.g. line selection, block selection or regular selection.)"""
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def __init__(self):
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self.reset()
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def reset(self):
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"""Forget the preserved state."""
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self._mode = ''
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self._text = as_unicode('')
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def conserve(self):
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"""Save the last visual selection ond the mode it was made in."""
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sl, sbyte = map(int,
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(_vim.eval("""line("'<")"""), _vim.eval("""col("'<")""")))
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el, ebyte = map(int,
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(_vim.eval("""line("'>")"""), _vim.eval("""col("'>")""")))
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sc = byte2col(sl, sbyte - 1)
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ec = byte2col(el, ebyte - 1)
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self._mode = _vim.eval('visualmode()')
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_vim_line_with_eol = lambda ln: _vim.buf[ln] + '\n'
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if sl == el:
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text = _vim_line_with_eol(sl - 1)[sc:ec + 1]
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else:
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text = _vim_line_with_eol(sl - 1)[sc:]
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for cl in range(sl, el - 1):
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text += _vim_line_with_eol(cl)
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text += _vim_line_with_eol(el - 1)[:ec + 1]
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self._text = text
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@property
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def text(self):
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"""The conserved text."""
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return self._text
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@property
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def mode(self):
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"""The conserved visualmode()."""
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return self._mode
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